% 满足题设的三角形，角 A = 36度， 角 B = 角 C = 72度。
\begin{tikzpicture}
    \pgfmathsetmacro{\bc}{2}
    \tkzDefPoints{0/0/B, \bc/0/C}
    \tkzDefPointBy[rotation=center B angle  72](C)  \tkzGetPoint{a1}
    \tkzDefPointBy[rotation=center C angle -72](B)  \tkzGetPoint{a2}
    \tkzInterLL(B,a1)(C,a2)  \tkzGetPoint{A}
    \tkzInterCC[R](A,\bc)(B,\bc)  \tkzGetFirstPoint{D}

    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegments(B,D)
    \tkzLabelPoints[above](A)
    \tkzLabelPoints[left](B)
    \tkzLabelPoints[right](C,D)
\end{tikzpicture}

